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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6176567c1848782f70d64f71dafe4834e3078a04b9b3953008f74cc3bf5322c' 
  AND token = 'J6aC1+/Bfe+r/TlM+riTIaXgf94HIhG0duLw0hgKeNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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