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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dc9ab6db32664c4da6b635f3f745b7b646590a54949aa61e1c75bee83c90de' 
  AND token = 'v6TMfm0JELimjyY3yRkrFkH5jPCPBJ7M1/i3PcS8QYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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