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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5807356141cfaa15f974dabf633bf159c811ed46f271f0f515b65da7cf3321' 
  AND token = 'A2PlL2hdXvnLRPhvX2vz26wJUNAaxb3lPnjiswMslE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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