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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70570a60cce88847d2fb91a350e5d56b507b81879ea35a1616bc34dd30689fa' 
  AND token = 'hjyGd3d3KyeP4r+HU6oXeNFsIJFZTnuK9PY7tw+JNs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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