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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af5fadc13ffca309750c583117475c1f779989f1ac2ce3a77a40592b555bec0' 
  AND token = '/diDW3ThSJ0QCvU+9kOIM3BuEdvSKISvDVbxteinmGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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