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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc09f6efd079196ebd8d72f6bf346c2db9b937509021e3ed10abacd2314aa0d' 
  AND token = '8EhmIy2Cn28gdVa/y7qV25aG/t+0Al49ldsZJ8kdLHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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