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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789519049fe99603df033b6ac93e21c2e0585db4a389feafb269600979701c70' 
  AND token = 'Rxt6838uJyhYe80b0xMHs3dz9/SQha9Haq2pWxTOD2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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