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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d334635121082e1cb6ccb97cf73d3303084391700c55a05657683175b2e537' 
  AND token = 'mdkDLzHvyghHp68P+BxPvGzHOfg5Z4SXa4fl2pg1UZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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