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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dd574f86e25ff0669359aacec786675ba61b646c925162ecd317ac8251ab96' 
  AND token = 'b3jOoPWyivgtniJojpmo6P9j16J/NCl/MLnELZst8rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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