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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b7a4b7bdce30ee3ee7a1287bf2479038d2ba7c4be3eecbe18b9079415c180e' 
  AND token = '3CqexnY+HpaS91XUbvLE7z/YLk8mYBNIaUFTmbBWoro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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