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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1848014ba4e43ad5d2626df42f83b1a3e66a31aeac2a888efd1b5efe8ef1e3cd' 
  AND token = '4qDt219zQJ45mK4dceabNIPU8SsKarD0jA9huH5lDQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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