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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb379054d45c96fa8c067b5bac2b1af7dd1fd49f0786480121b4e283049ef3a' 
  AND token = 'Bi96RkXx9OSQzcK2AdcnyYcHReCoPmvEWjiv1+d5VAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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