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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97a0badb4f38745dcd3ac0d14aadea4cf017e0afcf37d2f34016fb8e40dea40' 
  AND token = 'aiteNC8xZlYaH2wfM5IVmY0OKhtN8TdSBRwRKuyWh1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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