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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10efadb0b708bcfc162147bcc797556eb1814565dd5a98513a5adfa045c175fe' 
  AND token = '96w4MriaEOYWKbDAk6Z/ALeozf3dhVFAjQmWF0I6PHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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