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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af2f405b247ab683f28725203d0da90a133f0e16deddf53a60452ad528d75e0' 
  AND token = 'nHMGwt1YQr2yfX/RrcpcygZDt03spZmgadVBk9dGhjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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