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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d9385505c54ab730db39721cb1c9255ad81cb44cdb0d0ecdc99979bfb97a70' 
  AND token = 'fP9c7HchnC+SNDDn7jbaMoYlZzD3z6DoEhgQt9w1830=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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