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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbfbb351d6bd67241b660f889d9ff8a2bae9369552df05d0d457cdd77ea46bc' 
  AND token = 'bPGI94j5BriUpx05IvDA2YA+f3AuTka5YX0RO15JQt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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