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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e944c07f9e1c5f1c24d8273dde0d843cd139445a9defb394aed989e82873e5d' 
  AND token = 'TDPvVrvAZ1Ia7Nml15Q2GCOW2kgkRgVKOLEQbSX/iM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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