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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f2ec5a45e535b42c5b65feafd12cac44c4235f0b4f141bf56a79dd763c1517' 
  AND token = 'wRXbid+Jsdojns2EoqwfBc81bTg+QV4Ehu15qkXxr7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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