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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f11cbbaa95c9575c59d8185f6c91e998e60acf24db96114283e4e6d98385fe' 
  AND token = 'oc026EU4QUdcX2V41P135K/N012u5KYQeSbbbW0D/Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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