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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d9f997fadd34e09ea9ca3d304755fce25237317f2dc0b3cbb9e4e8b7808928' 
  AND token = 'Xrr8eox8AyStdZiQ/x5Cxx7xE6ysbQ5OfpXX1OobRxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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