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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cd158448e0430473a7321b391c18629aadf48ba67e2a9124744c50ac30c3ce' 
  AND token = '9/hl9YbUfJnypH/koXQ4RTFgPKs8dtHX0wBg35G1nK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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