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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c9a14c8f77fba3cfdb9fd5420bcb4e57121bbae0b9dac705ffbc3e2040dd2e' 
  AND token = 'q6FpqiSRC8XonGRkqC3D+aGtOr6QR/eXZnE9bciG7YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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