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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b23c72cf48cc7a1ee0ca1a6335aae93fe11d38c1fdb36068e638d0e03fdb0f' 
  AND token = 'fZxlOVDyPMMQeKrveUh4oh6EKjInu9RS01pvm4ecRKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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