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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0343440d607e08aeb0c0f2fbb69de85333aa131f9cdd8cd66a89d98bcf8979' 
  AND token = 'jcNlXUN+Di7A3PfhWID0oQd2NWh8fI/qrZgiTyxewKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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