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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e458dab3ff5cd746086a7e193d7d01d2e3f2e2aee6fbc39bf87afd75d3d72' 
  AND token = 'oiwBLos/qyEDRNxEZFXvEgD+ElTofY8Cq5DifWlzRcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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