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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef738f33c33bda1a78cbdfcd9c89ba92bf55a022f789d5a1dcc5ef6783e8e95' 
  AND token = '9VfhY9Bzy34Y+S+C2Akv5oz2nd9Qh3LkjTPrjLmnHZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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