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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6020d21599a072e9dbc3fa27339cedc49c564f4252c82c1bf953ed05f0cee198' 
  AND token = 'ShBl5hv9Kd1Bpw+zz3AaUUnhAtHyqchrbd0b7McRfIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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