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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60130c77e41b8382174a26b3bca326f012042a328c9fa46d66b4b7af25955fd8' 
  AND token = 'vzMA7dnuLUSsSVAF4RJW2IeVaRfRVRdgUn+z7JfS/zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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