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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484b2d4f7927471ffd0f3a0afb2de0bbe66dd94e5733adf3bc9f76778dc407f0' 
  AND token = 'VulK5FfTyX2Z+wHAJMnv0Ev1N008oAEubq9nukSDzjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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