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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3305514d2423433d2b5df0623f9a7eb2634403873ea4aa9bb3345efe2de5a68a' 
  AND token = 'PrbqoGehiQfQdK1P/43wopHycgIWQTJte9D/YWNc4LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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