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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39608c84437e4552d5976273c5d79f41657b23f82a5b138e9431e5c8ae44f93' 
  AND token = 'q6UPPh+ZaRyB5e3RyYHAEYsx0HCNUgNeOwrpWvQRcjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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