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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea7ce818ab890e58af34cf8b59b49f2017682a440fc78d49fdeca6f25b285ea' 
  AND token = 'GvAuWMZs35Kbql7xuKdr6QiCEZUvxnroghfh+8eJUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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