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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1766595a1eb74c7a5e65d17c8c9a9d4a00c6948500513888125cfc9125c79d5' 
  AND token = 'kC9bpZh3+80p0DJmgQUyJgyz5iWIKminvj1tI1iKKJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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