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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a63c3fb92a519b35abe0c6da4944d6bc96857ab3e902bd238e7e613a3ed869' 
  AND token = 'FQFzCf7GdkaPrIBdboGUn0EybFTEfSinf5EL5qIBBCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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