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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d578c87456512abdc0590ef2d6661867ae1bf76e2e2b78eb04e4c4a10732e5d' 
  AND token = 'ij3IBVelz/C0p+z9OPDL7DMrLNiHSoZD76VJ324w5mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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