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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508212c6fa2d4a9e0a04622d878778dde0f016b6d6c94843cba3b88301e9b1b4' 
  AND token = 'Tphm+Gj8JR+ckOIQpypcphttB3aZiCQsIIen3hCA6Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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