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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a318471d14f622d3ebfd06cb463e65430e5680210fa14083cbd1483df3f4d71' 
  AND token = 'DbPLXttXp+m4ydSRMVO6rv9AnGq5XmyzmKPh2fqVods=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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