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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f4c1a2dd1ec977acd37178cf23725a3b10434470591c72633ffdfd2e8fe57c' 
  AND token = 'XujDqQW8yfPWo1J7nz6AOL45PO1Q0zDvpZz8HBMLbZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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