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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebf57d27a565e62089565182e8ea9a8ebc9ab42d6ec6c6b602ac065e759fa85' 
  AND token = 'JTKPhOFui4iEr7UY+CDu7Yxy1l1Oo7c0NL28bfabIVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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