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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9327c8bf648613661633b64d2518068b0216ad6ffd1a2b1e6505a23c71b44d' 
  AND token = '0UYtK8b2sKpML1fPq5JaYELmLSkBl/pSV9bt5Gu5KGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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