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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96c86f0e189ec91e709ba2daf64d2ed9636745c897b546a7b27eedf71779ca7' 
  AND token = 'TG9oyyYbHItRk8aIiKIxXXO94PzWROfu3N0Cb29NASQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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