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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb99645ae5bbac6187db88c8424ff6e8c89cd2ec814450ec67b8998c06019c7' 
  AND token = '5L1AZ6JEtCIsLY8N6EIaEINDcHylUSanGct5SOIpmvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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