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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95034422702eea2da4c8b1c425d142f404ccbf10518c611475bff637b81f236' 
  AND token = 'fnqFk/k+B4mkQs1flbNCJd5xei+dIHr2hTco4XJ/7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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