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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6d377c249c7e6db1be6b84896d8559c9be6e3ec694f79df2a7a30357102a4e' 
  AND token = 'aZi8HvSpBOz0mniZjNYNNEH2YeqTYM6D/bwkvvz/zSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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