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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf40b562e57db079723b12f2d20629cd2eccdd962923d1bde7b1b09776e3d818' 
  AND token = 'Y18ouhK7H1EthP6yPL/uJpaq3+S7JdOuCuFXgKKvW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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