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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a606dabf4c5897eb641ca214fbf23c8307ceee18936dca77d862ce44689618e1' 
  AND token = 'qnCpEPQ34WV4b3eS2sBO2ZoKB34ajWayWGYzYUOVkyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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