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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67c93fce8b2ad0f0d16d622a94ab502bc7a5b6821e3a5578fb3e4c1df624c7b' 
  AND token = 'n/KWCHSB5W72wIb8eMnrOx42OO3TtsAA+dT8EG8A7uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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