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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c9ab8192c588a85d8d3e2176325c2f2ad525d37788fe8a3f39c422fbbc1897' 
  AND token = 'L5D6KU2T87YBmmZ1pvJB7LY1INA2QGDkWsx71anM7IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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