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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1536ea49bde2d4d624148db2f0e5833d31d9d9e23e65c2d5a72635561b6cc429' 
  AND token = 'aQGyKtP1JEKdo6Vz3okGunWClcViaF2zv9F6Fp3K2Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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