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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc69eea9baf7492b532061b464d1dcae13321df3364a19eb8e0c1888468874b' 
  AND token = 'AvlFKzgHxr2Bse3DXxfyy28mqTeu/yDhEuWitknSFNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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