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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907c1d19e5a43b00cc367819050b391f73c89c98684f6e525703cfbcffbbbcad' 
  AND token = 'ROLB/KdQ0uk/XEtCG+1a4oOxrYKWHQsd5gk9cp1EzcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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