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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf04911b077fd86ad3d6f02b8328a3218e9862c42b4f384d042a5f926f2324' 
  AND token = '/Z4CQfUWsvmCWf8wLcXTGi29BkLq72h6Z5EL7tmTSng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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