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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f678c377961906f21b64ef89651f346382d17fce2c3e2d4ae122c0bbb88e49e' 
  AND token = 'oZn1GyXBO9MlcC6rvKnWDfjbSkpJ1b1aZi0I7SN3cE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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