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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ed7900f4498382e6b09bdfe92d8e5d02cbd8175bd9cf4072cfc089c09160eb' 
  AND token = 'EQXVSUTiB+uWj4IjLidYZ9xPckoa+QXstVBAK8BeITk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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