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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c448ca9a13ac049740b783a2ff7761bfd37cb43c4c20bdc1772eb567ddee37e9' 
  AND token = '2Wcf5f4WPng1SD9rji1By86eZV0R5ilu8lwtAdd8g34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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