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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d7ca54a5a0327ecc2b6088b114ba697168928fdf2f8a252fae804d8193e939' 
  AND token = 'BYTALDginGl+NFp5W/XClvde9lTck89HLs2g1m6dtuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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