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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb470b327a752df783663114c73d29c5da6bd5076310a5ecd534f4bb5e70024' 
  AND token = 'GVBv6fiqdvOYdVn7DWpgG6JPTuhIX7HaPC/MJSi0Wa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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