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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fa90f4975d4e8802e499b42315cc93b31edef62bf2e7a3156d8c1f0214d091' 
  AND token = '9tIxytOyiN9b/UUAIktg7U+ur8EW+ldTequPZjVlJqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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