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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27440a96f92839f4d9d920af91d34fafba66126af59a8c17374759f186ee12b0' 
  AND token = 'rr7g9gcu6/ZjH61Nd0qTfvtFwLrOdABB3c3ryWeG0js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}